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When handling the battery, avoid squeezing or touching the six exposed lithium polymer cells.

Lift the battery from its edge nearest the logic board and remove it from the upper case.

If you're installing a new battery, you should calibrate it after installation:

Charge it to 100%, and then keep charging it for at least 2 more hours. Next, unplug and use it normally to drain the battery. When you see the low battery warning, save your work, and keep your laptop on until it goes to sleep due to low battery. Wait at least 5 hours, then charge your laptop uninterrupted to 100%.

If you notice any unusual behavior or problems after installing your new battery, you may need to reset your MacBook's SMC.

The trackpad from my macbook air would not click anymore. The pointer still worked, i could still tap and hoover around.

My guess was that something fell between the trackpad and the housing.

And I was right, it was a bread crumb or else of a little seed.

While following this guide, I saw that a little magnet underneath the unibody is lifting the trackpad up again, after being pushed down. Right in that tiny space was the little bugger :)

I'm with Stefan, about his comment by step 8. I actually did destroy one screw (there sat really, really tight) and had to use brute force with a pincer and a tip of WD-40 to loosen it. It seems like Apple took that into account, since there are enough to leave one out :)